华北平原典型压采区地下水循环的氢氧同位素示踪  

Application of hydrogen and oxygen isotopes to trace groundwater circulation in a typical groundwater exploitation reduction area,north China plain

作　　者：张靖坤 刘飞[1,2] 邹嘉文[1,2] 吕聪瑞 ZHANG Jingkun;LIU Fei;ZOU Jiawen;LYU Congrui(School of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056038,China;Hebei Key Laboratory of Intelligent Water Conservancy,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河北工程大学水利水电学院,河北邯郸056038 [2]河北工程大学河北省智慧水利重点实验室,河北邯郸056038

出　　处：《南水北调与水利科技（中英文）》2022年第2期385-392,共8页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金项目(41901039)。

摘　　要：选取地下水压采效果显著的邯郸黑龙港平原作为研究对象,运用氢氧同位素技术示踪现状压采条件下水循环过程,确定地下水的补给来源。结果表明,研究区内地下水和地表水主要接受大气降水补给,且都受到蒸发作用的影响。地表水的平均蒸发比例约为40%,且地表水氢氧同位素组成季节变化显著,雨季较旱季明显富集。地下水受蒸发作用影响较小,平均蒸发比例约为24%,其氢氧同位素组成季节变化不明显。深层承压水同位素富集现象很可能与上层潜水的越流补给有关;古地下水的输入使得部分承压水同位素贫化。地下水与当地地表水水力联系密切,其中地下水对老漳河的补给比例约为30%;老沙河对下游地区地下水的补给比例约为20%。研究结果对华北平原地下水可持续管理具有重要意义。The north China plain is one of the hotspots of groundwater depletion in China.The long-term groundwater over-exploitation has caused numerous geological and environmental issues such as large-scale groundwater depression cones,downward leakage from upper saline water,seawater intrusion,deterioration of water quality,etc.Since 2014,the Chinese government has initiated the groundwater exploitation reduction program to restore the groundwater resources and alleviate associated environmental problems in the north China plain.Due to the implementation of this program,the hydrological processes are expected to significantly change,and the groundwater level in some areas has shown an upward trend.The Heilonggang plain in Handan City,where the groundwater pumping reduction program yields significant effects,was selected as the study area to identify the processes of the water cycle and determine the groundwater recharge sources.The results of this study will have important implications for groundwater sustainable management in the north China plain.Hydrogen and oxygen isotopes were used as tracers for the water cycle with groundwater-pumping reduction.Multivariate statistical methods and GIS techniques were used to interpret these isotopic data.Rayleigh fractionation equation was used to calculate the evaporation loss.The two-component method was used to reveal the interchange volume between surface water and groundwater.Results exhibited that the stable isotope values in the surface water ranged from-6.4‰to-4.9‰inδ(^(18) O)with an average of-5.9‰,and from-47.5‰to-40.2‰inδ(D)with an average of-44.9‰in the wet season,while these values changed from-9.1‰to-3.6‰inδ(^(18) O)with an average of-7.2‰,and from-65.3‰to-49.8‰inδ(D)with an average of-58.4‰in the dry season.The isotopic compositions in surface water varied greatly from enriched isotopes in the wet season to depleted isotopes in the dry season.The slope(3.8)and the intercept(-29.2)of the surface water evaporation line were much smaller th

关 键 词：氢氧同位素 地下水 补给来源 华北平原 

分 类 号：TV213[水利工程—水文学及水资源] P641.3[天文地球—地质矿产勘探]